\centering
\begin{tabular}{P{2.5}P{-2.5}}
  \toprule
  \multicolumn{1}{c}{数学常数} & \multicolumn{1}{c}{物理常数} \\
  \midrule
  3.14159  & 2.99792 \\
  27.18281 & -17.58819 \\
  \bottomrule
\end{tabular}
